Roosting on top of food and water containers. help!

One of my chickens loves to roost on top of both the food and the water container. There are two roosts in their coop so not sure why she insists on sitting on top of the waterer and pooping in the water. I am having to change the water multiple times a day. I have put in a rabbit waterer and the girls will sometimes drink from that. Any ideas on how to stop Lola from roosting on the waterer and feeder?